Grailing machine



A. S. DONALDSON. GRAI'LING MACHINE.

APPLICATION FILED 0CT.I9. |9187 r Patented Aug. 22, 1922. i

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l I I I A. S. DONALDSON..

l GRAILING MACHINE. r l APPLICATION FILED OCT. I9, i918. 1,426,364. Patented Aug. 22, 1922'.

2 SHEETS-SHEET 2.

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ALFRED S. DONALDSON, 0F NEWARK, NEW' JERSEY, ASSGNOR T0 E41',- DU PONT DE NEMOURS it COMPANY, OF WILMINGTON, DELAWARE, A CORPORATION OE DELAWARE.

GRAILING MACHINE.

Application led October 19, 1918. lSerial No. 258,874.

T 0 all whom t may concern Be it known that l, ALs-nnb S. DoNALDsoN, of Newark, in the county of Essex and- State of N ew Jersey, have invented a certainnew and useful Improvement in Grailing Machines, and do hereby declare that the following is a full, clear, and exact description thereof. I

My invention relates particularly to a machine designed for grailing, that is to say, which is provided for the purpose of shaping the edges of, and grooving the teeth of combs, which may be made out 0f any desired material, but which may be, for example, made from a plastic composition containing nitrocellulose and camphor.

The object of my invention is to provide a grailing machine which will ynot only oper` ate upon one side of a set of large teeth in a comb, but which will operate simultaneously upon the other side thereof, and which is adapted to operate also simultaneously upon both sides of a set of small teeth in a comb. A further object is to decrease the Cost of manufacturing combs by providing a machine of this character, while at the same time increasing the uniformity of the product. 4

Further objects of my invention will appear from the detailed description thereof contained hereinafter.

While my invention is capable of embodiment in many different forms, for the purpose of illustration lhave shownonly one type of my invention inthe accompanying drawings, in which:

Fig. 1 is a side elevation partly in section of a machine made in accordance with my invention.

Fig. 2 isa plan view of the same.

Fig. S is an end 'view of the same.

Fig. 4 is a side elevation of a bracket.

Fig. 5 is an end viewy of the same.

Fig. 6 is a plan view of the same.

Fig. 7 is a plan view of a slide. j

Fig. 8 is a side elevation ot' 'the same. I

Fig., 9 is a rear elevation of the same, and

F 10 is a separate view of the comb. Y

In the drawings, l have shown a main casting or frame 1 having bolts 2 to attach the same to any suitable support. rlfhe main casting l. supports at the front thereof a vertically adjustable table 3 which may be adapted to be adjusted by means of a screw d extending into a screw-threaded hole 5 therein, which screw t may have two fixed washers 6 and 7 attached thereto above and below the frame l, through which the vscrew 4 passes, and it may. be provided also with y an operatingfhandle 8 below the frame 1. At its two ends, the table 8 may be provided with two circular openings 9 and 10 to receive pins 11 and 12 secured in the main frame 1, and adapted to act as guides for the table 3. lSaid table 3 is designed to sup port a comb 13 or the like while being. operated upon. by the machine. rlhe comb 13 prior to being operated upon by the machine, may have a pluralityl'of large teeth Maand a plurality of small teeth 15 which may have been formed on the comb blank merely by sawing recesses 16. A purpose ofthe machine may be to provide shaped edges 17 for the teeth andl grooves 18 between the teeth. To the rear of the table 3 the lframe 1 may be provided with a'pair vof spindle bea-'rings 19 and 2O to receive a fixed spindle Patented Aug. ee, ieee. i

21 which `may carry apulley 22 designed'v to be driven by a belt 28 fromany suitable source of power. Upon the other end ofthe spindle 21 there may be `a grailing cutter'y 2li comprised of a pluralityfof disc saws'z25 separated by washers ,26, and held in place against a shoulder 27 and a washer 25E-upon the spindle 21 by means of a washer 29 and a shouldered nut 30 vwhich may bev screw-` threaded'on the spindle 21. To the rear of the bearings 19 and 20 the frame 1 may carry an upright extension 31 on which there l may be a dove-tailed forward extension 32 to receive a vertically slidingy spindle car-` riage. The carriage 33 maybe moved by a screw 34 screw-threaded ina hole` 35 in the carriage 33, which screw may have;

shoulders 86 and 37 to position in a plate 38 which maybe secured by screws 39 to the top of the forward extensionA 32.v Thel screw 34 at its upper end may have an oper-A ating handle lO. On the carriage 33 vthere may be two spindle'bearings 41 and 42 to receive an adjustable spindle i3 v h avingapulley eel at one` end, drivenby al belt l5 trom any .suitable source of power, and kept taut by an idler e6. On the other end of sa id shaft there may be another grailing cutter i7 constructed thesame as the grailing cutter 2st. Upon one end of the carriage 33 there may be, furthermore adjustably supported a toothed stop 4S comprising a plurality of teeth 4:9 adapted to t in the recesses 16 of for example the comb 13. This stop 418 may be supported upon a horizontally adjustable slide 530 which may have a dove-tailed extension 51 fitting in a horizontal dove-tailed groove 52 on a right angle bracket 58, which may carry a screw 54: to hold the slide in itsv adjusted position. The right angle bracket 53 furthermore may have a horizontal dove-tailed extension located in a position at right angles to the extension 51, which may lit in a dove-tailed groove on aslide 57, a screw 5S or the like being' provided to hold the dove-tailed iension 55 in its adjusted position. rllhe side 5^( may be furthermore provided with a vertically extending dove-tailed groove 59 fitting over a dove-tailed extension 60 on the end of the carriage 33, and an adjusting screw 61 may be screw-threaded in the carriage 33 to adjust the position of the slide 57 by co-operation with a yoke plate 62 or the like, which may fit between shoulders 653 and G4- on the screw 61, and may be secured by screws 65 to the slide 57.

in the operation of my invention, a comb or the like of any thickness and with any sized teeth may be placed upon the table rEhe position of the adjuste` le spindle may be then adjusted in a vertical direction by the operation of the handle 40 to the extent rcquired by the thickness of the comb and the depth of the groove 18 desired. The position of the stop 48 may be then adjusted also ac cording to the thickness of the comb, the width of the teeth, and the length of the recesses.16,as compared with the length of the grooves 18y desired, by movement of the stop 48 inthe three planes at right angles to one another. Thereupon the comb 13 is fed between thel two grailing cutters 9A and i7 until the ends of the recesses 16 in the comb are stopped by the ends of the teeth 49 on the stop 41:8.v The comb 13 may be then moved until the next set of recesses 16 are opposite the teeth 49, and the operation repeated in this manner until the entire comb has been grailed. Of course, where there are a large number of combs to be finished, ea ch of which contains large and small teeth, the large teeth of the entire number of combs may be grailed, and thereafter the apparatus may-be reset and the small teeth in all of the combs may thenbe grailed. 1n this way, it

`will be seen that both sides of the particular set ofteeth operated upon, whether large or small, are grailed at the same time and notwithstanding the dimensions of the comb and teeth carried thereby.

lWhile I have described my invention above in detail l wish it to be understood that many changes may be made therein without departing from the spirit thereof.

l claim:

1. 1n a g'railing machine, in combination, a rotary disc cutter' for grailing one side of a comb, a second cutter for grailing the other side of a comb, the two being arranged to receive the comb between them as fedV from one side of the cutters, a comb stop comprising a tooth base and a substantially straight stop tooth therewith and located .in the plane side of the comb, the two being. arranged to receive the comb between them as fed from the one side of said cutters, and a comb stop havin g a substantially straight tooth located at the other side of the cutters, such stop comprising a tooth base with said tooth projectingl forwardly therefrom inthe plane of the comb-receiving space between the cutters and for a distance at least as great as the length of the comb tooth to be grailed, and of width to pass between the comb teeth.

1n a grailing machine, in combination, a rotary disc cutter for grailing one side of a comb, a second cutter for grailing the other side of the comb, the two being' spaced from each other and arranged to receive the comb between them in said space, a comb supporting structure located at one side of said cutters and having a work table with its forward edge spaced from, and located at said side of, the cutters and substantially opposite said space, a co1nb-stop-supporting structure located at the other side of the cut'- ter, and a comb stop carried by said second named structure substantially opposite said space and in position to be contacted by the comb as the same is fed forward from said table edge and through the space between rthe cutters.

et. 1n a grailing machine, in combination, a

rotary disc cutter for grailing one side of the comb, a second cutter for grailing the other side of the comb, said cutters being spaced from each other to receive the comb between them, a work table located at one side of the cutters and means for adjusting' such table in a plane parallel to the plane of the cutters, thereby to adjust its position and that of the tabled comb with respect to one of the cutters and determine the depth of the cut of such cutter, a comb stop, relatively thin in the direction of the plane of the cutters to permit approach to the cutters to abut the comb, and means for adjusting' said stop, in a plane parallel to the ilane of the cutters, in corre spondence with the adjustment-or1 said table, thereby to locate said thin stop in position to suitably abut the tabled comb.

5. In a grailing machine, in combination, a rotary disc cutter 'for grailing one side of the comb, a second cutter for grailing the other side of the comb, said cutters being spaced from each other to receive the comb between them, a work table located at one side of the cutters and means for adjusting such table in a plane parallel vto the planel of the cutters thereby to adjust its position and that of the tabled comb with respect to one of the cutters and determine the depth of cut of such cutter, a comb stop having a blade-like tooth, relatively narrow to permit projection between the cutters, and adapted for projection between the comb teeth to abut the comb shank between said teeth, and means for adjusting said stop tooth in a plane parallel to the plane of the cutters, in correspondence with the adjustment of said table, thereby tolocate said narrow blade-like tooth in position to suitably abut the shank of the tabled comb.

6. In a grailing machine, in combination, a pair of rotary disc cutters arranged the one above the other and spaced from each other to receive the comb to be grailed therebetween, a work table located at one side of the cutters substantially'opposite the space therebetween, means for vertically adjusting' said table thereby to adjust said table with respect to one of said cutters and determine the depth of cut of such cutter, a stop-toothsupporting structure located at the other side of the cutters and carrying a stop tooth opposite said space and projecting Vforwardly, in the plane of the comb-receiving space betweenv the cutters, for a distance at least as great as the lengthcf the comb tooth to be grailed, such tooth being blade-like, and relatively narrow to permit projection between the cutters, and adapted for projection between the comb teeth to abut the vcomb shank between said teeth, and means for vertically adjusting said stop-tooth-supporting structure in correspondence with. the adjustment of the table, thereby to locatev said lnarrow blade in position to suitably abut the shank of the tabledcomb. t

7. n combination, a rotary disc cutter'for grailingv one side of a comb, a cutter for grailing the other side of the comb,` and a toothed stop for the comb having an adjustable supporting means adapted to be adjusted in three planes at right anglesto .one another. j 4 A 8. ln combination, a rotarydisc cutter for grailing one side of a comb, a cutter for able with regard to the first mentioned cutter, and a toothed stopfor the comb having an adjustable supporting means adapted to be adjusted in three planes at right angles to one another.

In testimony that I claim the foregoing I have hereunto set my hand.

ALFRED S. DONALDSON. Witnesses:

LUTHER D. REED, HENRY B. CILAEEEE.

so grailing the other side of the comb, adjust- .f 

